How to fit your first trail run into a strength training week

For your first trail run, keep the route short enough that you can pay attention to the ground, and avoid putting a demanding leg session immediately afterwards. An easy road 5K and a hilly trail 5K do not ask the same thing of your legs. Start with one trail outing in a week you already understand, then judge the next lift by how you actually feel.

That approach works for someone who already runs and lifts. If you are new to running altogether, build a comfortable run-walk routine first; the NHS Couch to 5K plan is one starting point.

Why does a short trail run feel different from a road run?

Climbs change your effort even when your pace drops. Descents bring repeated braking steps, especially if the path is steep or unfamiliar. A review of downhill running research reports that slope, speed and duration influence muscle damage, and that runners less accustomed to descents tend to experience more of it. The studies examine specific downhill protocols; they do not mean every gentle woodland path will leave you sore.

Pick a route with a way to turn back, rather than committing to a long loop. Walk the steep descent if your footing feels uncertain. Leave your road pace target at home: effort and time on feet tell you more on uneven ground.

What does a first trail-running week alongside lifting look like?

Here is an illustrative, non-prescriptive week for someone already comfortable with two lifts and two runs. The trail outing replaces one familiar run; it is not an extra session added to a full calendar.

Day	Session	Why it sits there
Monday	Full-body lift with your main lower-body work	Keep the more demanding leg work away from the first trail outing
Tuesday	Rest or easy walking	Check how you respond to Monday’s lift
Wednesday	Easy road run, 25–35 minutes	Maintain a familiar running reference point
Thursday	Shorter full-body lift using familiar exercises	Avoid testing new, high-volume leg work before the trail
Friday	Rest	Arrive able to pay attention to the route
Saturday	Easy trail run or run-walk, 25–40 minutes	Choose a manageable route with modest climbing and a clear turn-back option
Sunday	Rest or relaxed walk	Give yourself room to assess soreness before Monday’s lift

If Saturday’s descents leave your quads sore on Monday, shorten or soften that lift rather than defending the table. If you feel fine, repeat a similar route before increasing distance or climbing. Do not raise both in the same outing just because the first one went well.

The NHS adult activity guidance recommends aerobic activity alongside strengthening work on at least two days a week. That is a population guideline, not a target this example week claims to fulfil for every person: duration, intensity and the rest of your activity matter.

When should the gym session move?

The Thursday lift is the first place to adjust if your legs are still heavy by Saturday. Keep the session but reduce unfamiliar lower-body work, or move it earlier if your diary allows. After a tougher trail outing, check whether Monday’s planned squats still feel controlled in the warm-up before loading them as normal.

For a longer Sunday run already central to your training, read where to put strength around a long run. You can also use the running and strength week guide to choose exercises that fit the running you already do.

How do you make the next trail outing sustainable?

Keep a note of the route’s time, hills and how your legs felt the next day. A flat 35-minute run and a 35-minute run with a long descent occupy different places in a strength week. The useful progression is the one you can repeat while still doing your other sessions well.

Telos Fitness lets you choose running and strength, set your available hours and rearrange sessions around your schedule. Its next 14-day block uses recent training, adherence, recovery and performance signals. Use that structure to give the trail outing a real place in your week, then review what happened before adding more climbing.